<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 1. str.startsWith()
        // str.startsWith(seaerchString[, position])
        // seaerchString : 要搜索的字符串
        // position      : 在str中开始搜索查找的位置 默认为0

        // 作用：判断字符串是否以某个子串开头
        const str = "To be, or not to be, that is the question.";

        console.log(str.startsWith('To be'))
        console.log(str.startsWith('not to be', 10))


        // 2. str.includes() 
        // 判断一个字符串是否包含在另一个字符串中   true / false
        // 区分大小写
        const str2 = "To be, or not to be, that is the question.";

        console.log(str2.includes('To be')) // true
        console.log(str2.includes('To be or'))  // false





    </script>
</body>
</html>